Home › Words › H › hypopermeabilityhypopermeabilityhypopermeability means permeability to a lesser than usual degree.EtymologyFrom hypo- + permeability.nounpermeability to a lesser than usual degreee.g.“"This may lead to hypopermeability of the pylorus and diminution of the filling of the bulbus."” — 1922, Teodor Barsony, International Medical and Surgical Survey: Obstetrics and ..., Volume 3, Issue 3:Definitions & examples from Wiktionary (CC BY-SA 3.0).